HCl as a Primary Standard?

Question: Why is HCl not suitable as a primary standard?
Answer:  There are three main reasons why HCl is not suitable as a primary standard:

• HCl is not a solid at room temperature and pressure. 
• HCl cannot be obtained at a very high purity.
• HCl does not have a high molecular mass.

You can find out more about what makes, and does not make, a primary standard at:
http://www.ausetute.com.au/titrstand.html

What is the best indicator for titration?

Question: What is the best indicator for titration?
Answer: That all depends on what you are titrating!

If you doing an acid-base titration, then you will need to know the relative strengths of the acid and base you going to be using.
Once you have determined an approximate pH for the equivalence point of the neutralisation reaction, you use this as the pH of the endpoint of the titration in order to determine the best acid-base indicator to use.

Determining Hypochlorite in Bleach

The active ingredient in household bleach is sodium hypochlorite, but just how much hypochlorite will you find in a litre of bleach?
You can easily find out in your school lab, all it takes is a redox titration, which, ofcourse, you will find at AUS-e-TUTE!
AUS-e-TUTE Members should log-in to the Test Centre to use the new tutorial with drill, game and test.

Visit http://www.ausetute.com.au for a complete list of "free" tutorials available for non-members.
Get information about how to improve your chemistry results at http://www.ausetute.com.au/membership.html
Begin improving your chemistry results at http://www.ausetute.com.au/register.html

Standard Solutions

What is the difference between a primary standard and a secondary standard in volumetric analysis?
What substances can be used as a primary standard?
How do you make a standard solution?

All these questions are answered in AUS-e-TUTE's new tutorial on standard solutions.
Members should log-in and go to the Volumetric Analysis section on the index page, or,
follow the links from your Chemistry syllabus study guide.
Members will also find a game, test and exam as well as tutorial on this topic.
Teachers will find  a worksheet wizard which will let you make, and print off, a worksheet on this topic.

Not an AUS-e-TUTE Member?
There is currently a "free-to-view" tutorial at http://www.ausetute.com.au/titrstand.html

Ethanol Content of Beer and Wine

AUS-e-TUTE has added new resources for determining the content of ethanol in alcoholic beverages such as beer and wine.
Members should go to :
http://www.ausetute.com.au 
and log-in to the Members Only Test Centre to find the new Ethanol Redox Titration tutorial, game and test.
Teachers will find a new worksheet wizard for preparing Ethanol Redox Titration worksheets in the Teachers Only section of the website.